Enizemum scutellare (Lange 1911

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 52-53

Enizemum scutellare (Lange 1911 ,

Homotropus albopictus var. scutellaris )

Homotropus albopictus Lange 1911 (primary homonym)

Homocidus rubiginosum Schmiedeknecht 1926 (syn. nov.)

Enizemum junctum Dasch 1964a

Diagnosis. Fore wing length 5.8–7.7 mm in females, 4.9–5.6 mm in males. Antenna in females with 23 to 24, rarely 22 flagellomeres, dark brown, at most with some pale brown areas ventrally or on scape, with multiporous plate sensilla also present on ventral surface of the apical flagellomeres, although less densely distributed than dorsally; in males with 22–23 flagellomeres, with broad tyloids on flagellomeres 6/7 to 13/14. Mesoscutum and mesopleuron with punctures small and very dense, interspaces finely coriaceous. Propodeum with pleural and lateral longitudinal carinae present, median longitudinal and transverse carinae absent or present only as traces. First tergite with median dorsal carinae converging only over basal half, forming a distinct angle and subparallel on apical half of the tergite (cf. Fig. 14 E). Second tergite with basal carinae strong.

Colouration of females. Antenna black. Head and mesosoma black, face without yellow central face patch, clypeus and mouthparts usually orange, usually yellow-marked on hind corner of pronotum and tegula, subtegular ridge, small shoulder mark and upper mesepimeron; scutellum sometimes with yellow tip. Hind corner of mesopleuron or mesosternum sometimes marked with orange. Legs and coxae orange; femora orange, hind femur often dark apically; hind tibia with a white base, remainder dark, hind tarsus dark. Metasoma black.

Colouration of males. As in females but with yellow ventrally on scape and pedicel, entire face, large part of hind corner of pronotum, subtegular ridge, propleuron, epicnemium; mesosternum and mesopleuron on ventral half orange with yellow markings on mesosternum and lower mesopleuron; scutellum sometimes orange with a yellow margin. Fore and mid coxae and legs often largely yellow. Hind tibia often with basal white marking extended to about half the length of the tibia.

Material examined. Holotypes of Homotropus albopictus Lange and Homotropus albopictus var. scutellaris Lange : Germany, Erzgebirge , leg. Lange. 2♂, at NMF.

New for France: Col-des-Montets, 23.VII.1975. 1♂, at ZSM . New for Italy: Süd-Tirol, San Martino di Castrozza, 1444m, leg. E.Bauer, 18.VII.1934. 1♂, at ZSM . New for Switzerland: Valais, Champéry , Col de Bretolet , 1920m, N46.143, E6.7968, 16.V.1964, 1♀, 14.VII.1964, 1♂, at MZL.

Finland (2), France (1), Germany (2), Italy (1), Switzerland (6).

Distribution. Western Palaearactic.

Notes. This species was formerly only known from the male, as females were usually identified as E. ornatum , with which it shares the strong carination of the basal tergites. The longer and uniformly dark antenna, the generally larger size and more extensive yellow colouration of the mesosoma, however, permit reliable identification of females also. Some of the biological information published under E. ornatum might actually relate to E. scutellare . For instance, Scaeva pyrastri (Linnaeus) was recorded as a host of E. ornatum ( Rotheray 1984) . I could identify a female Enizemum reared in Switzerland from S. pyrastri as E. scutellare ; but could not examine Rotheray’s material, so it remains unclear whether these two species have overlapping host ranges. The reared specimens of E. ornatum should be re-examined to establish sound host ranges.

Manukyan (1995) synonymized Homocidus rubiginosum Schmiedeknecht , a species described from a single male from Germany, with E. nigricorne . Homocidus rubiginosum is, however, conspecific with E. scutellare (Lange) (syn. nov.).

Figures

FIGURE 14. A. Phthorima compressa ♀, metasoma. B. Enizemum ornatum ♀, hind tibia. C. Enizemum ornatum ♂, hind tibia. D. Homotropus frontorius ♀, hind tibia. E. Enizemum ornatum ♀, first tergite. F. Enizemum nigricorne ♀, first tergite. G. Homotropus elegans ♀, first tergite. H. Homotropus sundevalli ♀, first tergite. I. Enizemum ornatum ♀, clypeus. J. Homotropus elegans ♀, clypeus. K. Fossatyloides gracilentus ♂, antenna. L. Fossatyloides gracilentus ♀, propodeum. M. Homotropus pictus ♀, propodeum. N. Homotropus crassicornis ♀, propodeum.